Green’s Dictionary of Slang

1. a shilling (5p).

1812		Vaux Vocab. of the Flash Lang.
1823		‘Jon Bee’ Dict. of the Turf, the Ring, the Chase, etc.
1835		G. Kent Modern Flash Dict.
1848		Flash Dict. in Sinks of London Laid Open.

2. thus, a shilling’s worth.

c.1786		Grose Classical Dict. of the Vulgar Tongue ms. additions n.p.: Bob-Stick of Slim. A Shillings worth of Punch. Cant.
1789		G. Parker Life’s Painter 137: I say, call for a bobstick of rum slim.
1821		W.T. Moncrieff Tom and Jerry II v: Hang cards! bring me a bob-stick of rum slim or a glass of Barsac.